public static void main(String args[])
  {
    try {
          SAXParserFactory factory=SAXParserFactory.newInstance() ;
          factory.setNamespaceAware (true);
          SAXParser  saxParser=factory.newSAXParser();
          MyHandler handler=new MyHandler();
          saxParser.parse(new File("1.xml"),handler);
        }
    catch(Exception e)
     { System.out.println(e);}
  }
}
class MyHandler extends DefaultHandler
{
   boolean isComputabled=false,math=false,english=false;
   int count_1=0,count_2=0,count_3=0;
    float mathSum=0,englishSum=0,sum=0;
   
   public void characters(char[] ch,int start,int length)
   {
     
     String text=new String(ch,start,length);
     if(isComputabled==true)
       {
          String str=text.trim();
          if(str.length()>0)
          {
           int d=Integer.parseInt(str);
           sum=sum+d;
           if(math)
             mathSum=mathSum+d;
           if(english)
             englishSum=englishSum+d;     
           isComputabled=false;
          }
       }
     System.out.print(text);
     
   }
   public void startElement(String uri,String localName,
                           String qName,Attributes atts)
   {
    String str=null;
    if(uri.length()>0)
       str=uri;
    System.out.print("<"+qName);
     if(qName.endsWith("月薪"))
     {
      count_1 ++;
      isComputabled=true;
     }     
        
     
    for(int k=0;k<atts.getLength();k++)
    {
        
       System.out.print(" "+atts.getLocalName(k)+"= ");
       System.out.print("\""+atts.getValue(k)+"\"");
       if(atts.getValue(k).startsWith("科长"))
       {
        math=true;
        count_2 ++;
       }
       if(atts.getValue(k).startsWith("科员"))
       {
        english=true;
        count_3 ++;
       }
    }
      System.out.print(">");
      
      
   }
   public void endElement(String uri,String localName,String qName)
   {
      System.out.print("</"+qName+">");
       
   }
    public void endDocument()
   {
       System.out.println(" ");
       System.out.println("人员总数:"+count_1);
       System.out.println("科长人数:"+count_2);
       System.out.println("科长人数:"+count_3);
       System.out.println("工资总额:"+sum);
       System.out.println("科长工资总额:"+mathSum);
       System.out.println("科员工资总额:"+englishSum);
      
   }
  
}

为什么这样解析 工资总额和科长工资总额都相同啊 怎么处理啊